He can thank the internet as the vehicle that helped him shoot up to stardom.
It was first Youtube that was the vehicle for him to get noticed. As he says in this article, he posted a video, and had some viewers, then more viewers, then tens of thousands of views. This led to a record deal and a professional manager. He now tours the world for concerts.
The involvement of the internet was not just to get him noticed initially. The twitter savvy teen continues to use the microblogging platform as a marketing and communication tool to stay in touch with his fans, all 3.19 million of them! And he follows back some 70,000 of those fans!
As one media columnist is quoted in the article: Bieber is "the biggest legitimately monetized social media phenomenon of our time".